Caelics

The Caelics are an extraterrestrial species that has made a sudden and unexpected appearance on Earth following an attempted an ongoing forceful military takeover of Earth starting in 2035. Some have even learned speak terrestrial languages. They have a steadily dwindling population due to the spread of a highly contagious manufactured disease.

History
Sometime before June 2035, a nonlethal airborne nanovirus called the Caelic Infertility Virus began to spread on the Caelic homeworld of Ue. It is impossible to tell where the disease came from, though many blame the Acuana'im. The virus is airborne and the only thing it seems to do is cause instant irreversible infertility in males by rendering sperm cells useless. Female gametes are unaffected. Later it was learned that the human race is genetically similar to their own species, and thus, to prevent their race from dying out, they created the Elainn Initiative, an organization of national powers banding together in order to conquer Earth to seize a new population base.

Appearance
The Caelic race is remarkably similar to humankind. Their appearance has been likened to that of humans of Scandinavian descent. In comparison to humans, they have large skeletal frames and tend to be more muscular than humans. Caelics almost invariably have blonde hair and pale skin. They may have red, blue, green, amber, or purple eyes.

Genetic Makeup
Tests have been done  to determine the genetic makeup of the species and it has been found that they are extremely close to Humans. In one experiment at an OlaTech facility in Greece, sperm cells extracted from a prisoner of war who didn't show symptoms of the Caelic Infertility Virus were able to fertilize human egg cells. These embryos were destroyed after three days, though it is believed that it would be possible for both humans and Caelics to successfully produce viable offspring due their similar genetic makeup.